I plan to work with the idea of first chorus during the next month. Such a provocative opening to muse about. Thanks to Heidi Siwak (@HeidiSiwak) for mentioning, Creativity from Constraints.
"First chorus" is a musical term for an initially played melody that provides the notes, chords, and keys used in the variations or improvisations that follow. For example, Mozart used the traditional melody Twinkle, Twinkle, Little Star as the basis for 12 variations. First choruses in other domains also supply components to be recombined and changed. In painting Seurat and Signac used Monet's mosaic-shaped brush strokes as a first chorus for developing the dots of pure color that characterize Pointillism.
Patricia D. Stokes PhD. Creativity from Constraints: The Psychology of Breakthrough (Kindle Locations 82-85). Kindle Edition.